/*
silverPDF is sponsored by Aleyant Systems (http://www.aleyant.com)

silverPDF is based on PdfSharp (http://www.pdfsharp.net) and iTextSharp (http://itextsharp.sourceforge.net)

Developers: Ai_boy (aka Oleksii Okhrymenko)

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above information and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR SPONSORS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

*/
#region PDFsharp - A .NET library for processing PDF
//
// Authors:
//   Stefan Lange (mailto:Stefan.Lange@pdfsharp.com)
//
// Copyright (c) 2005-2008 empira Software GmbH, Cologne (Germany)
//
// http://www.pdfsharp.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Diagnostics;
using System.Collections;
using System.Text;
using System.IO;
using PdfSharp.Pdf.Advanced;
using PdfSharp.Drawing;
using PdfSharp.Fonts.TrueType;
using PdfSharp.Fonts;
using PdfSharp.Internal;
using PdfSharp.Pdf.Filters;

namespace PdfSharp.Pdf.Advanced
{
  /// <summary>
  /// Represents a PDF font.
  /// </summary>
  public class PdfFont : PdfDictionary
  {
    /// <summary>
    /// Initializes a new instance of the <see cref="PdfFont"/> class.
    /// </summary>
    public PdfFont(PdfDocument document)
      : base(document)
    {
    }

    internal PdfFontDescriptor FontDescriptor
    {
      get
      {
        Debug.Assert(this.fontDescriptor != null);
        //if (this.fontDescriptor2 == null)
        //  this.fontDescriptor2 = (PdfFontDescriptor)Elements.GetValue(Keys.FontDescriptor, VCF.CreateIndirect);
        return this.fontDescriptor;
      }
    }
    internal PdfFontDescriptor fontDescriptor;

    internal PdfFontEncoding FontEncoding;

    internal PdfFontEmbedding FontEmbedding;

    //PdfFontOptions FontOptions
    //{
    //  get { return this.fontOptions2; }
    //}
    //PdfFontOptions fontOptions2;

    /// <summary>
    /// Gets a value indicating whether this instance is symbol font.
    /// </summary>
    public bool IsSymbolFont
    {
      get { return this.fontDescriptor.IsSymbolFont; }
    }

#if true_
    public string BaseFont
    {
      get { return Elements.GetName(Keys.BaseFont); }
      set { Elements.SetName(Keys.BaseFont, value); }
    }

    public int FirstChar
    {
      get { return Elements.GetInteger(Keys.FirstChar); }
      set { Elements.SetInteger(Keys.FirstChar, value); }
    }

    public int LastChar
    {
      get { return Elements.GetInteger(Keys.LastChar); }
      set { Elements.SetInteger(Keys.LastChar, value); }
    }

    public PdfArray Widths
    {
      get { return (PdfArray)Elements.GetValue(Keys.Widths, VCF.Create); }
    }

    public string Encoding
    {
      get { return Elements.GetName(Keys.Encoding); }
      set { Elements.SetName(Keys.Encoding, value); }
    }
#endif

    internal void AddChars(string text)
    {
      if (this.cmapInfo != null)
        this.cmapInfo.AddChars(text);
    }

    /// <summary>
    /// Gets or sets the CMapInfo.
    /// </summary>
    internal CMapInfo CMapInfo
    {
      get { return this.cmapInfo; }
      set { this.cmapInfo = value; }
    }
    internal CMapInfo cmapInfo;

    /// <summary>
    /// Gets or sets ToUnicodeMap.
    /// </summary>
    internal PdfToUnicodeMap ToUnicodeMap
    {
      get { return this.toUnicode; }
      set { this.toUnicode = value; }
    }
    internal PdfToUnicodeMap toUnicode;


    /// <summary>
    /// Adds a tag of exactly six uppercase letters to the font name 
    /// according to PDF Reference Section 5.5.3 'Font Subsets'
    /// </summary>
    internal static string CreateEmbeddedFontSubsetName(string name)
    {
      StringBuilder s = new StringBuilder(64);
      byte[] bytes = Guid.NewGuid().ToByteArray();
      for (int idx = 0; idx < 6; idx++)
        s.Append((char)('A' + bytes[idx] % 26));
      s.Append('+');
      if (name.StartsWith("/"))
        s.Append(name.Substring(1));
      else
        s.Append(name);
      return s.ToString();
    }

    /// <summary>
    /// Predefined keys common to all font dictionaries.
    /// </summary>
    public class Keys : KeysBase
    {
      /// <summary>
      /// (Required) The type of PDF object that this dictionary describes;
      /// must be Font for a font dictionary.
      /// </summary>
      [KeyInfo(KeyType.Name | KeyType.Required, FixedValue = "Font")]
      public const string Type = "/Type";

      /// <summary>
      /// (Required) The type of font.
      /// </summary>
      [KeyInfo(KeyType.Name | KeyType.Required)]
      public const string Subtype = "/Subtype";

      /// <summary>
      /// (Required) The PostScript name of the font.
      /// </summary>
      [KeyInfo(KeyType.Name | KeyType.Required)]
      public const string BaseFont = "/BaseFont";

      /// <summary>
      /// (Required except for the standard 14 fonts; must be an indirect reference)
      /// A font descriptor describing the font�s metrics other than its glyph widths.
      /// Note: For the standard 14 fonts, the entries FirstChar, LastChar, Widths, and 
      /// FontDescriptor must either all be present or all be absent. Ordinarily, they are
      /// absent; specifying them enables a standard font to be overridden.
      /// </summary>
      [KeyInfo(KeyType.Dictionary | KeyType.MustBeIndirect, typeof(PdfFontDescriptor))]
      public const string FontDescriptor = "/FontDescriptor";
    }
  }
}